Reservoir And Production Characterization Through Multi-well Pressure Deconvolution Analysis to Optimize Field Development Strategy in Pematang Lantih Field, Jambi

Andhy Kurniawan, Reffi Erany, A. Aslanyan, D. Gulyaev, S. Joshi, Guruh Ferdyanto
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引用次数: 1

Abstract

Target reservoir and production characterization study was carried out in Pematang Lantih field, Jambi, Indonesia. The Talang Akar Formation has 10 underlying reservoirs from 600 m to 900m TVDSS. This multi-layers sandstone structure is driven by regional tectonic stress and complicated by several faults. Sharp oil well production decline was observed during 3 years period since initial production in 2015, with GOR increase. Arresting production decline was the key objective for efficiency increase, hence improved reservoir characterization was needed, as cross-well reservoir properties/interference were unclear. Multiwell Retrospective Test (MRT) is a recent development used to study reservoirs by carrying out automatic matching of historical production rates and bottom hole. It provides practical, fast yet robust analysis for reservoir evaluation. It can quantify inter-well pressure interference and evaluate cross-well reservoir properties. The main goal of this study was to get better reservoir understanding and evaluate ability of this technique to deliver additional value at current reservoir conditions, considering initial data availability/quality. The key technology element used is multi-well pressure deconvolution, which is a highly parallelizable decoding algorithm running on multi-core workstation. The analysis is carried out on historical well pressure and production data. Hence no field operation is needed and there is no production deferment since it does not require additional field data acquisition. The technique delivers formation pressure history and productivity index history in tested well reconstruction. It is also proficient to reconstruct cross-well interference and estimate cross-well transmissibility from offset wells towards the tested well. Another result is evaluation of formation pressure decline impact on oil production of the existing wells. The study area has reservoir pressure that dropped below bubble point and continues declining. Historical data over 3 years, from a cell consisting of 4 producers was analyzed using this technique. The analysis found uniform formation transmissibility between the analyzed wells at Pematang Lantih field. Transmissibility was estimated by analyzing cross-well transient responses (CTR) calculated with multi-well deconvolution. CTR is a function representing BHP response to neighbor well single rate production. CTR is interpreted with interference test technique thus estimating transmissibility values. The analysis result confirmed that all 3 offset wells have a pressure impact towards the pressure-tested well (PLT-X) with quantified values. Connectivity analysis showed the expectation of rapid production decline if there was no pressure maintenance system. The recommendation was to estimate the economics of pressure maintenance system implementation in order to improve production performance. By using multi-well deconvolution analysis, the entire 3-years cell production history was converted into a single unit-rate pressure transient that enabled deep reservoir investigation and calculation of field reserves undisturbed by dynamic well boundaries.
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通过多井压力反褶积分析油藏及产量特征,优化油田开发策略
在印度尼西亚Jambi的Pematang Lantih油田进行了目标储层和产量表征研究。Talang Akar组有10个下伏储层,深度为600米至900米。该多层砂岩构造受区域构造应力驱动,并受多处断裂的影响。自2015年投产以来的3年时间里,油井产量急剧下降,GOR增加。阻止产量下降是提高效率的关键目标,因此需要改进储层特征,因为井间储层的性质/干扰尚不清楚。多井回溯测试(MRT)是一项最新发展,用于通过对历史产量和井底进行自动匹配来研究储层。它为储层评价提供了实用、快速、可靠的分析方法。该方法可以量化井间压力干扰,评价井间储层物性。本研究的主要目标是更好地了解储层,并评估该技术在当前储层条件下提供额外价值的能力,同时考虑到初始数据的可用性/质量。其关键技术是多井压力反褶积,是一种运行在多核工作站上的高度并行化解码算法。对历史井压和生产数据进行了分析。因此,不需要现场作业,也没有生产延迟,因为它不需要额外的现场数据采集。该技术可在测试井改造中提供地层压力历史和产能指数历史。在重建井间干扰和估计邻井向测试井的井间透射率方面也很熟练。另一个结果是评估地层压力下降对现有油井产量的影响。研究区储层压力已降至泡点以下并持续下降。使用该技术分析了一个由4个生产者组成的细胞3年来的历史数据。分析发现,该油田各分析井间地层渗透率均匀。通过分析多井反褶积计算的井间瞬态响应(CTR)来估计传输率。CTR是表示BHP对邻井单速生产响应的函数。用干扰测试技术解释CTR,从而估计透射率值。分析结果证实,所有3口邻井都对试压井(PLT-X)产生了量化的压力影响。连通性分析表明,如果没有压力维持系统,预计产量将迅速下降。建议评估压力维持系统实施的经济性,以提高生产性能。通过使用多井反褶积分析,将整个3年的单元生产历史转换为单个单位速率压力瞬变,从而可以在不受动态井界干扰的情况下进行深层油藏调查和计算油田储量。
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